Nowadays people are troubled by the violence that spreads throughout the media. Movies, television and video games are full of gunplay and bloodshed, and one might reasonably ask what's wrong with a society that presents videos of violence as entertainment. Viewing large amounts of violent television and video games may well contribute to violent behavior in certain individuals. The trouble comes when researchers downplay uncertainties in their studies or overstate the case for causality . Skeptics were dismayed several years ago when a group of societies including the American Medical Association tried to end the debate by issuing a joint statement: "At this time, well over 1,000 studies... point to a causal connection between media violence and aggressive behavior in some children." Freedom-of-speech advocates accused the societies of catering to politicians, and even disputed the number of studies (most were review articles and essays, they said). When Jonathan Freedman, a social psychologist at the University of Toronto, reviewed the literature, he found only 200 or so studies of television-watching and aggression. And when he weeded out "the most doubtful measures of aggression", only 28% supported a connection. The critical point here is causality. The alarmists say they have proved that violent media cause aggression. But the assumptions behind their observations need to be examined. When labeling games as violent or non-violent, should a hero eating a ghost really be counted as a violent event? And when experimenters record the time it takes game players to read "aggressive" or "non-aggressive" words from a list, can we be sure what they are actually measuring? The intention of the new Harvard Center on Media and Child Health to collect and standardize studies of media violence in order to compare their methodologies, assumptions and conclusions is an important step in the right direction. Another appropriate step would be to tone down the criticism until we know more. Several researchers write, speak... What does the writer think of the debate concerning the relationship between the media and violence? A) He more than agrees with the views held by the alarmists. B) It should come to an end since the matter has now been settled. C) The past studies in this field have proved to be misleading. D) More studies should be conducted before conclusions are drawn.
D

Technology is changing our lives. Our present aerospace  companies are gradually disappearing as private space concerns are being born every day. I'm going to discuss three spacebased businesses that are sure to soon influence us all. First we have to make space travel cheaply and safely. Engine design is the main challenge. To make money in space, the cost of space travel will have to diminish . This problem will be the most difficult to solve. Liquid fueled rockets are the only way to get out of Earth's orbit. Finding new ways to power the flight to space is also another big challenge. Finding the key to cheap space travel might be the biggest story of our times. There are a lot of great minds working on this problem. And companies are pouring money into research and development. In the next few years we'll see the first suborbital tourist. And not long after that we should really start to see new and exciting things as competition heats up. Spacecraft design and production will naturally follow rocket technology. All sorts of crafts will be needed for the wide uses they'll be tasked with. Several companies in the United States have already made small, lowcost test vehicles. Resources in space will provide great mining profits to those who can afford the cost of setting up such a huge operation. Can you imagine finding a huge asteroid  of pure gold? The benefit to mankind is limitless. Mining on other planets, like Mars, also adds CO2 into the very thin atmosphere. Over time this can lead to the formation of an atmosphere similar to Earth's. Space is going to offer us untold opportunity and wealth. But this is only going to occur if wealthy investors step forward and fund the first steps forward. It is certain that technology will take us to worlds we could never have imagined. According to the passage mining on other planets might help   _  . A) increase the travel benefits there B) form the atmosphere like Earth's there C) bring some new species there D) create more job opportunities there
B

We all waste food, you and me, every day, millions of tons of it.In China, enough food is wasted in restaurants every year to feed 200 million people.And the amount of food wasted by Chinese consumers is increasing fast.So our nation is being encouraged to stop wasting food. So what should Chinese consumers do to prevent food waste? Keep a kitchen diary All of us should keep a kitchen diary, and we can know that how much food we waste at home.The first thing for us to do is to stop throwing away food that we can still eat.We should eat everything we buy and if we cannot, we should buy less. Buy only what we need We should ask for smaller portions in stores.We should also check how much food we have before buying more.We shouldn't bring much food we don't need home even if large posters ask us to do so. Develop the habit of packing food Chinese consumers are generous and friendly.In restaurants, often too much food is ordered and served.So when ordering out, we are supposed to exclude the food in the order if we don't plan to eat it.And order smaller servings in   restaurants and take home what we cannot finish. Don't put it off! Let's stop food waste today! In order to urge more and more people to prevent food waste, we design a poster with the words   _  . A) Enjoy the food! B) Keep healthy! C) Share the dish! D) Waste not, want not!
D

It never occurred to Sun Yukun that the decision he made four years ago would have an impact on his career. When the 22-year-old entered college in 2009, he decided not to change his rural residence to a students' collective one. But when he finished college and was offered a job with a state-owned enterprise in Beijing, Sun was told that he couldn't accept the offer unless he had an urban hukou (household registration record). This time, he had no choice but to change his residence status. Transferring hukou to a university became optional in 2003, and many students are confronted with the dilemma of whether to do so or not. Professionals suggest they make the decision based on their current situation and future plans. 'I regret transferring my hukou' Wang Jinbi, 20, is an accounting major at Beijing Union University. Coming from Chifeng, Inner Mongolia autonomous region, she transferred her hukou when she enrolled at university. "I didn't think it was a big deal," Wang says. "Since I'm registering under an urban hukou, it doesn't matter whether it's in Beijing or Inner Mongolia, I thought." What Wang didn't expect, however, is that she would regret her decision later. "After two years of study, I've figured out my future plans. I want to return to my hometown and make a living there," she says. That means Wang needs to transfer her hukou back again, which she worries will be a troublesome procedure. "I have a friend who graduated last year. She spent a lot of time and energy transferring her hukou back to her hometown again due to complicated paperworks," says Wang. Guidelines for transferring hukou Wang's experience is not uncommon. Many students don't know what their decision means for their future. In order to help these students, Xie Yongqiang, from the Chengdu Municipal Bureau of Justice, posted a guideline for transferring hukou on a micro blog. According to Xie, students should firstly think about where they're going to stay. "If you like the city where you're studying and are considering staying... Which of the following statements is NOT true? A) Sun Yukun thinks the decision he made four years ago would have an effect on his career. B) Wang Jinbi regrets transforming her hukou and she wants to stay at home. C) Xie Yongqiang says if someone likes the city where they're studying and are considering staying there after graduation, then he should transfer Hukou. D) Tang Yanwei wantsto stay in Beijing, so he transforms his hukou.

A